| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 5 |
0.7%
|
| 0 | 703 |
98.6%
|
|
| 10 | 1 |
0.1%
|
|
| 20 | 2 |
0.3%
|
|
| 40 | 1 |
0.1%
|
|
| 60 | 1 |
0.1%
|